Why is my car still overheating?

I have replaced the radiator cap putting the correct one on. Replaced the thermostat also the water pump. The frist thing that we did was flush the radiator cause some idiot had put the wrong coolant in there. We have noticed that there will be coolant on the pan at the bottom of the engine. Sometimes it even overheats with the heat on but there is no sign of the heater core going bad. What else could it be?

Does it overheat while sitting still,
driving, or both? If it's only
overheating while driving then it's
most likely the front air dam
attached to the lower core support
right under the bumper. The f-bodies
are notorious for having that dam
break on parking stops and they will
overheat while driving. Anything over
approx 25mph and the main fan
won't kick on because the air flow
caused by the moving vehicle is
enough to keep it cool. Check under
the front bumper for the dam, no
dam, no air flow, it overheats.

okay thank you all we checked out everything it turns out there was a leak from a bad gasket it the water pump and also we had a failing head gasket which is now blown thank goodness we were at home when it did. Now our major concern is getting that fixed we can get it to ourselves so we our gonna try to repair it.. any advice?

If you are going to hold off for a day
or two I can pull the exact procedure
from Chiltons and copy and paste it
for you with the head bolt torque
sequence and the intake bolt torque
sequence. You should be able to
pick up all the gaskets and the head
bolts for under $200. You have to
replace the head bolts because they
are what's called torque to yield and
are non reusable.

im having the same problem with
my 93 camaro v6.doesnt overheat
when sitting .only over heats while
driving .suggestions?i also noticed i
have a water leak.
Oil is good
Radiator recently replaced
No thermostat

Hey my 97 camaro keeps
overheating and i have changed the
relay, water pump, sensor,
thermostat, but some one mickey
moused my fans cuz they never
kicked in so i have to turn them on
manuel, but it still over heats

my overheating was because leaves got between the radiator and the AC radiator. Cleaned that out and it made a big difference. Plus I use only antifreeze in the engine. Water and metal don't mix. Hoses don't rot out as quick either.

i am having this same problem with over heating in my 97 chevy
camaro 30th anniversary. we have changed the water pump,
radaitor, temp sensor, fan relay, thermostat, hoses, heater core
and we have even done a head test to see if thier was
something happening thier and that test came back as passing
mean no head issue. they were working till we just replaced the
heater core and added a after market temp gage inside the car
and now the fans are not coming on so what could be causing
this now????? UGGHHHH FEEL LIIKE I CANT WIN WITH MY
CAR AND IT IS REALLY STARTING TO HURT MY FEELINGS
CUZ I LOVE MY CAR.

Water pump is leaking, inspected yesterday to see how bad it was, then after letting car cool, opened radiator cap to check coolant levels, and some air was let in or out, and after that the engine st...

Water pump is leaking, inspected yesterday to see how bad it was, then after letting car cool, opened radiator cap to check coolant levels, and some air was let in or out, and after that the engine st...

I have a 98 Cavalier overheating, i've changed the hose from the firewall to where ever (transports the antifreeze). Also the heat switches back and forth from hot to cold. This car has NOT had a the...